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-The data comes from Media Create annual sales report (Senjou no Valkyria 1 & 2 games) and Famitsu annual sales report "provisional" (Senjou no Valkyria 3 games).
-Digital sales are not tracked.
-Media Create is regarded as the most complete and reliable source, but their chart for 2011 top sales games is not yet available, so I'm using the "provisional" Famitsu chart for Senjou no Valkyria 3 games.
-Sales for every game are slightly bigger because when the games can't reach a set position in the sales chart, the data is no longer provided to the public, but at this point in the game lifespan, sales are minimal and don't represent an impact in total sales numbers.
-There is something odd going on with the Extra Edition, the game was released in November, 23 and the Famitsu chart tracks till December, 25, so there is some data missing.
I will bring you any update if needed when Media Create 2011 chart is available to the public.
All in all, I think is safe to say that there is a strong fanbase in Japan, all the regular releases of the games has reached 150.000 copies sold. It's true that we don't know how much they spend to make the games or how much profit Sega gets from them (plus toys, books...) but there are games that sold way less and they get sequel all the time.